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In this video I am testing the accuracy of api 5 in one test strips against the api master test kit for freshwater using some nasty water from a sitting tank with waste. This is why you should never use strips. In addition to this video I have had strips tell me my ph was 6 and kept adding coral to the filter to raise it, just to order a mastertest kit and find out ph was actually 9, while the test strips still said the water was 6.